Printing plateholder



Feb. 9, 1943. a R E ER 2,310,547

PRINTING PLATE HOLDER Filed June 6, 1940 9 30 j zderzW? Patented Feb. 9, 1943 UNITED STATES PATENT OFFICE PRINTING PLATEHOLDER Siegmund J. Roesner, Oak Park, 111.

Application June 6, 1940, Serial No. 339,165

1 Claim.

My invention relates to printing plate holders of the type illustrated in my Patent No. 1,955,933, dated April 24, 1934. However, the present embodiment does not deal with the means for clamping the holder to the bed of the press, so that there is no connection with the clamping structures in my patent in this respect.

My improvement deals more particularly with the means for alining the holder in the diagonal slots of the bed, and one of my objects is to provide an expedient for this purpose which permits the holder to be set at any angle that the position of the printing plate may require.

A further object of the invention is to design the holder with means to retain it in its proper place even when it is imperfectly or somewhat loosely secured to the bed.

Another object of the invention is to construct a holder which is universally applicable, not requiring different forms for different positions.

An important object of the invention is to design the novel holder along lines of extreme simplicity.

With the above objects in view and any others which may suggest themselves from the description to follow, a better understanding of the invention may be had by reference to the accompanying drawing, in which- Fig. 1 is a plan view, showing the application of the holder;-

Fig. 2 is an enlarged section on the line 2-2 of Fig. l; and

Fig. 3 is a perspective view of the holder from the under side.

In accordance with the foregoing, I denotes the printing plate, and II the fiat or cylindrical bed of the press to which the plate is applied. The plate is usually chamfered at the edges as indicated at I2 for the application of the holding plate I3, whose forward edge I4 is undercut to fit the edges of the plate III in the manner indicated in Fig. 2.

The bed II is formed with a series of parallel dove-tailed slots I 5 in which the clamping means for the holding plate are located. The conventional form of clamping means consists of a screw I6 directed from the holding plate into the recess I5, the head I! of the screw seating in a flared cavity I8 in the top of the holding plate. The screw I6 is threaded into a block I9 which is first deposited edgewise in the slot I5 and then positioned horizontally as indicated in Fig. 2 to receive the screw. The side edges 20 of the block have the same inclination as the sides of the groove so that the advance of the screw draws up on the block and clamps the holding plate I3 firmly in the set position.

Where an installation is made as just described, there is always the chance that the holding plate I3 may move from its set position when it is engaged or struck in a lateral direction, particularly when the screw I6 has loosened somewhat. Such an eventuality, especially if present in more than one holding plate, would prejudice the proper setting of the printing plate I0. I therefore extend the holding plate I3 downwardly with a short stem or boss 2| which is circular and makes a close sliding fit into the mouth of the slot I5. Now the holder I3 cannot move laterally of the slot, even should the screw I6 become slightly loosened. However, the holder may still be moved longitudinally of the slot in case its adjustment requires it.

It will be evident that the stem 2| is but a very simple extension of the holding plate I3, being integral therewith and easily adaptable to the standard bed construction. At the same time, the stem is short, so that it does not appreciably add to the material used for the holding plate, rendering the cost of the improved plate practically the same.

While I have described the invention along specific lines, various minor changes and refinements may be-made without departing from its principle, and I desire to consider all such changes and refinements as coming within the scope and spirit of the appended claim.

I claim:

A clamp for a printing plate laid on a base formed with grooves, comprising a clip formed to engage an edge of the printing plate, a stem depending from the clip into one of said grooves to guide the clip for sliding motion along the groove and form a vertical pivot for the rotary adjustment of the clip for the engaging application to said edge, and means to clamp said clip to the base at any point in the clips path of rotation, said stem being circular in horizontal section and filling the entrance to the groove with a sliding fit.

SIEGMUND J. ROESNER. 

